G-bate foe furnaces



UNTTED sTATEs PATENT oEEioE.

THOMAS E. PURCHASE, OF DANVILLE, PENNSYLVANIA.

GRATE FOR FURNACES.

Specification of Letters Patent No.

To all whom it may concern:

Be it known that I, THOMAS E. PURCHASE, of Danville, county of Montour,in the State of Pennsylvania, have invented a new and useful Improvementin Grrates for Furnaces; and l do hereby declare that the following is afull and exact description thereof, reference being had to theaccompanying drawings and to the letters of reference marked thereon.

My invention relates to certain improvements in the grates of puddling,or other furnaces, and has for its object the construction of the gratein such manner tha-t the lire in any particular locality may be droppedwithout affecting the rest.

Previous to my invention the grate of a furnace has been constructedwith a series of comb-like grate bars interlocking each other and soarranged as to be capable of being turned to shake up the ire or let itdrop through; but in this description of grate the whole body of firemust be affected simultaneously and no portion of the lire can bedropped without dropping the whole.

The nature of improvement consists in the combination of a series ofcomb like grates or grate bars so arranged as to be each capable ofbeing oscillated on its axis independently of the others (as will behereinafter fully described) in order that any desired part of the firemay be affected without aecting the rest.

ln the accompanying drawings forming part of this invention Figure 1represents a front elevation of a puddling furnace in which is arrangedone of my improved grates. Fig. 2 represents a vertical lateral sectionof the same. Fig. 3 represents a skeleton perspective of the grate barsand frame. Fig. 4 represents a plan of the same. Fig. 5 represents planand end views of one of the double comb bars. Fig. 6 represents bottomand end views of one of the single or side bars. Fig- 7 represents aperspective viewof the same. Fig. 8 is a perspective of the turning keyor wrench and Fig. 9 is a perspective view of one of the retaining caps.

The same parts are indicated in the different views by the same letters.

A is the body of the furnace B the air chamber, and C its door.

The double combs consist each of a bar D, which is hung at each end soas to turn 27,155, dated February 14, 1860.

freely on its axis and is formed with a series of radiating arms a, onopposite sides, each set of arms a., interlocking with those of theadjoining comb (see Fig. 4). The single or side combs (which aresometimes called hermaphrodite bars are formed of a oar E, similar to D,and similarly hung, but having only one set of arms l), and beingforme-d with a stop plate e. The bars D and E, are all formed withsquared ends to accommodate a key by which they are turned (as will bepresently described).

,F are retaining keys which are hollowed out to fit over the squaredends of the bars D and E and are formed with a projecting feather f (seeFig. 9) which fits into a corresponding slot or spline in the frontplate or door of the air chamber. By this formation and arrangement ofretainer F, the bars D and E are held in the desired position. 5

G is the key for shifting or turning the grate bars and the form ofwhich will be comprehended by reference to Fig. 8.

The operation of my improved grate,illus trated at Fig. 2, where it willbe seen a part of them have been so turned as to discharge the cinderwhile the other portion still holds up the material and tire beingworked; the bars are only capable of oscillating on their axes, afterthe retaining keys or collars F, have been extricated from their seats,so that when it is desired to drop the cinder they are collected at themost convenient part of the surface of the grate and separately from thematerial to be retained, when the retaining keys of those bars whichsustain the cinder are removed and said bars by the turning key Gr areshifted to drop the cinder into the air chamber (as illustrated at Fig.

2) after which the said bars are turned back 95 to their normal positionand locked by the replacing of the retaining keys F. lt will be seenthat not only can a part of the lire be dropped without affecting theremainder which is a desideratum of vital importance in the puddlingfurnace, but also that any locality in the body of the tire may beagitated at pleasure which is a great desideratum in all kinds offurnaces, since it often happens that to economically manage the fireonly certain parts should be agitated (or raked) at certain times.

I do not limit my invention to the employment of any particular numberof comb grate bars, nor to the particular method of holding them inposition. Neither do I Wish ently of the others substantially asspecified to be understood as claiming broadly the for the purposes` setforth. 10 combination of comb-like grate bars; but In testimony whereofI have hereunto set What I claim as my invention and' desire I my' handand axedjmy seal. I I 5 to secure by Letters Patent i- THOS. E.PURCHASE. [L.S. The combination of a series of comb-like Witnesses: v Ygrate bars each interlocking the other and Y A. F. RUSSEL,

each capable of being oscillated independ- R. CATHCART.

